| 摘要 |
An error detecting and failure indicating system and method in a servo loop in which an electrical bridge network is provided having a D.C. output to operate a differential amplifier, and a comparator including another differential amplifier responsive to both the D.C. output and an A.C. square wave reference voltage, one of the arms of the electrical bridge network being purposely unbalanced so as to provide over a predetermined control range of the servo loop a D.C. output signal voltage which may be varied over the control range in accordance with a sensed condition and which output signal voltage upon a failure arising in the system may exceed or decrease below preset limits of the predetermined control range set by the peaks of the A.C. square reference voltage so as to cause the differential amplifier of the comparator to provide a steady D.C. output voltage of a polarity dependent upon the sense of the failure arising in the system.
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